Pricing condition - How to Determine/Calculate price excl. VAT

Hi,

We've the following configured:

ZPMC - payment costs - 1 euro (price incl. VAT)

MWSI caculates VAT over all items and posts them to the appropriate G/L account.

The payment costs excl. VAT needs to be posted to a G/L account aswell. However in our current configuration no 'payment cost excl. VAT' amount is available. One solution would be calculating the 'amount excl. vat' via a routine however i would like to whether we can achieve this via customizations / standard configurations?

Inputs are greatly appreciated.

Kind regards,

Tim